#!/bin/bash

# Path to the temperature sensor and PWM control
TEMP_SENSOR="/sys/class/hwmon/hwmon1/temp1_input"
PWM_CONTROL="/sys/class/hwmon/hwmon2/pwm1"  # Adjust this path as needed

# Function to set fan speed using PWM control
set_fan_speed() {
    local speed=$1
    echo $speed | sudo tee $PWM_CONTROL
}

# Wait for the hwmon files to be available
while [ ! -f "$TEMP_SENSOR" ] || [ ! -f "$PWM_CONTROL" ]; do
    echo "Waiting for hwmon files..."
    sleep 1
done

echo "hwmon files found. Starting fan control."

# Main loop
while true; do
    # Read the current temperature
    temp=$(cat $TEMP_SENSOR)
    temp=$((temp / 1000))  # Convert to degrees Celsius

    # Print the current temperature
    echo "Current temperature: $temp°C"

    # Adjust fan speed based on temperature
    if [ $temp -lt 50 ]; then
        set_fan_speed 25  # Approximately 25% speed
    elif [ $temp -lt 60 ]; then
        set_fan_speed 45  # Approximately 50% speed
    elif [ $temp -lt 65 ]; then
        set_fan_speed 60  # Approximately 75% speed
    elif [ $temp -lt 75 ]; then
        set_fan_speed 120  # High speed
    else
        set_fan_speed 255  # Maximum speed
    fi

    # Check for critical temperature
    if [ $temp -ge 85 ]; then
        echo "Critical temperature reached: $temp°C" | sudo tee /dev/kmsg
        set_fan_speed 255  # Ensure fan is at maximum speed
    fi

    # Sleep for a while before checking again
    sleep 10
done